Double quantum point contacts in series

Y. Takagaki, D. K. Ferry

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


A quantum-mechanical calculation of ballistic electron transport in a double-point-contact structure is presented. We include in our model structure the presence of side leads between opposite point contacts, a flared geometry around the corner of the intersection region, and a potential barrier in the constrictions. Nonadditivity of conductances is investigated for various geometries. When two constrictions are placed in close vicinity, the total transmission through the double quantum point contacts is determined by the narrower one. When the same number of channels are transmitted in both point contacts, the conductance takes a value between Ohmic addition and the adiabatic limit. A transmission resonance originating from bound states in the cavity region is observed when the side leads are pinched off, and is discussed in terms of the parity of the wave function.

Original languageEnglish (US)
Pages (from-to)13494-13498
Number of pages5
JournalPhysical Review B
Issue number23
StatePublished - 1992

ASJC Scopus subject areas

  • Condensed Matter Physics


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